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iptables
Accept a Port/range
# iptables -A INPUT -p tcp -m tcp --dport 80 -j ACCEPT
Forward a Port/range
- Add the forwarding rule
# iptables -t nat -I PREROUTING -i external -p tcp –dport 4662 -j DNAT –to 192.168.0.11:4662
- Enable forwarding rule
# iptables -I FORWARD -i eth0 -p tcp -d 192.168.0.11/32 –dport 4662 -j ACCEPT
- Add forwarding rule for internal hosts
# iptables -I FORWARD -i eth0 -p tcp -s 192.168.0.11/32 –dport 4662 -j ACCEPT